It probably depends on your class... a warrior I dont think will care too much about socket gear , due to the secondaries on the BC gear are just absolutely dumb +4 dodge and +2 parry (and other trash like that)! wow! and crusader is still amazing. You can still stack versatility up to 30% (non bg)... that and crit might be the way to just go.
Mastery also depends on your class.
But level 28 Greens are pretty much just better than any dungeon drop, so you have to wait for more to show up in the AH. I've seen a few "peerless"... but they are trash, if you get one with any speed stat... tuck it away because it will be a lottery ticket.
I would still bank that the Runeblade of baron rivendare's will be BiS for anybody who can use the two hander with crusader swaps. Not enough is known yet, but that thing is bonkers with the bonus. It just sucks now because strathholm service entrance is no longer on the finder que